How to check the quality of the water in your home or everywhere else?

From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking ‘x10’ image. Fun, translucent blue housing that’s very strong and durable. Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm.